ACL Race Series Rod Bearing Set, Standard Size with Extra Oil Clearance for 1986-2005 Mazda, Kia, and Mercury (B6/BP/BP-T) 4B8351HX-STD

Fits select 1986-2005 Mazda, Kia, and Mercury models including the Miata, Protege, 323, Rio, and Capri (B6/BP/BP-T engines).

Engineered for high-performance and competition use, the ACL Race Series rod bearing set is designed to withstand the high RPMs and heavy loads found in turbocharged or high-compression builds. These bearings feature a hardened steel back with a tri-metal copper-lead overlay to provide superior fatigue strength and load-carrying capacity compared to standard OE components.

This specific set (4B8351HX-STD) is a standard size bearing but features the "HX" designation, providing extra oil clearance. This additional clearance is essential for performance builders who require increased oil flow for better lubrication and cooling of the crankshaft journals under extreme racing conditions. They are a direct replacement for factory bearings when the crankshaft remains at its original factory journal diameter.

• Manufacturer Part Number: 4B8351HX-STD
• Series: Race Series
• Size: Standard (STD) with Extra Oil Clearance (HX)
• Construction: Tri-metal hardened lead/tin/copper bonding
• Engine Compatibility: Mazda B6, BP, and BP-T
• Application: High-performance/Competition use only